Electrohydraulic sheet forming is a high-velocity manufacturing process, which utilizes a pressure pulse induced by underwater electrical discharge to plastically shape metals. It has attracted wide interest for its potential to shape metal materials with poor formability. Such advantages can be exploited by combining this process with the conventional stamping process or by using it solely. In both cases, the dominant deformation mode is stretching, implying substantial thinning of sheet metal. The goal of this paper is to improve the material flow control in electrohydraulic sheet forming. A controllable drawing deformation mode is introduced into the electrohydraulic sheet forming process by using a radial inward pulsed Lorentz force at sheet edge induced by an electromagnetic coil, which can substantially enhance the draw-in of the sheet flange. The flexible combination of the stretching deformation and the introduced drawing deformation allows active control of the high-velocity material flow behavior, thus enabling much better control of the final forming quality. About 20 % improvement of the forming height limit is observed from the experimental results. Furthermore, a numerical model is established to better understand the process mechanism, and the critical roles of the amplitude and the action timing of the radial inward Lorentz force are identified.

电液薄板成型是一种高速制造工艺，它利用水下放电引起的压力脉冲使金属塑性成形。它因其在成形性差的金属材料方面的潜力而引起了广泛的兴趣。通过将此工艺与传统冲压工艺相结合或单独使用，可以利用这些优势。在这两种情况下，主要的变形模式是拉伸，这意味着金属板显着变薄。本文的目标是改进电液片材成型中的材料流动控制。利用电磁线圈在板材边缘产生径向向内脉冲洛伦兹力，将可控拉伸变形模式引入电液板材成型工艺中，可大大提高板翼缘的牵引力。拉伸变形和引入的拉伸变形的灵活组合允许主动控制高速材料流动行为，从而更好地控制最终成型质量。从实验结果观察到成形高度极限提高了大约 20%。此外，建立了一个数值模型以更好地理解过程机制，并确定了径向向内洛伦兹力的幅度和作用时间的关键作用。从实验结果观察到成形高度极限提高了大约 20%。此外，建立了一个数值模型以更好地理解过程机制，并确定了径向向内洛伦兹力的幅度和作用时间的关键作用。从实验结果观察到成形高度极限提高了大约 20%。此外，建立了一个数值模型以更好地理解过程机制，并确定了径向向内洛伦兹力的幅度和作用时间的关键作用。